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Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance $ 352,402     $ 236,568  
Provision for loan losses (25,064) $ 134,365 $ (46,834) 230,329  
Loans charged off (18,304) (15,570) (35,209) (34,487)  
Recoveries of loans previously charged off 2,856 1,491 5,293 3,187  
Ending balance 311,890 435,597 311,890 435,597  
Provision Details [Abstract]          
Change in provision due to changes in reasonable and supportable forecasts, primarily due to COVID-19 pandemic (34,200)        
Other changes to provision 579        
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 32,877 28,514 36,921 25,137  
Provision for off-balance sheet credit risk (8,590) 4,405 (12,634) 7,782  
Ending balance 24,287 32,919 24,287 32,919  
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 21,236,813   21,236,813   $ 22,772,827
Individually measured for impairment, recorded investment 179,636   179,636   234,693
Total 21,416,449   21,416,449   23,007,520
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 298,115   298,115   366,199
Individually measured for impairment, related allowance 13,775   13,775   22,441
Total 311,890   311,890   388,640
Commercial [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 231,372     151,868  
Provision for loan losses (18,442) 111,153 (28,335) 188,876  
Loans charged off (16,502) (14,487) (31,847) (31,102)  
Recoveries of loans previously charged off 1,875 318 3,551 780  
Ending balance 198,303 310,422 198,303 310,422  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 12,736 14,040 14,422 11,578  
Provision for off-balance sheet credit risk (2,642) 542 (4,328) 3,004  
Ending balance 10,094 14,582 10,094 14,582  
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 12,360,303   12,360,303   12,910,376
Individually measured for impairment, recorded investment 112,604   112,604   167,159
Total 12,472,907   12,472,907   13,077,535
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 188,227   188,227   235,882
Individually measured for impairment, related allowance 10,076   10,076   19,052
Total 198,303   198,303   254,934
Commercial real estate [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 81,746     47,185  
Provision for loan losses (10,582) 17,221 (15,161) 22,336  
Loans charged off (800) (1) (1,063) (887)  
Recoveries of loans previously charged off 176 75 206 122  
Ending balance 70,540 68,756 70,540 68,756  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 18,298 12,575 20,571 11,767  
Provision for off-balance sheet credit risk (5,950) 3,844 (8,223) 4,652  
Ending balance 12,348 16,419 12,348 16,419  
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 4,220,869   4,220,869   4,671,292
Individually measured for impairment, recorded investment 26,123   26,123   27,246
Total 4,246,992   4,246,992   4,698,538
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 66,841   66,841   83,169
Individually measured for impairment, related allowance 3,699   3,699   3,389
Total 70,540   70,540   86,558
Paycheck Protection Program [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 0     0  
Provision for loan losses 0 0 0 0  
Loans charged off 0 0 0 0  
Recoveries of loans previously charged off 0 0 0 0  
Ending balance 0 0 0 0  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 0 0 0 0  
Provision for off-balance sheet credit risk 0 0 0 0  
Ending balance 0 0 0 0  
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 1,121,583   1,121,583   1,682,310
Individually measured for impairment, recorded investment 0   0   0
Total 1,121,583   1,121,583   1,682,310
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 0   0   0
Individually measured for impairment, related allowance 0   0   0
Total 0   0   0
Loans to individuals [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 39,284     37,515  
Provision for loan losses 3,960 5,991 (3,338) 19,117  
Loans charged off (1,002) (1,082) (2,299) (2,498)  
Recoveries of loans previously charged off 805 1,098 1,536 2,285  
Ending balance 43,047 56,419 43,047 56,419  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 1,843 1,899 1,928 1,792  
Provision for off-balance sheet credit risk 2 19 (83) 126  
Ending balance 1,845 1,918 1,845 1,918  
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 3,534,058   3,534,058   3,508,849
Individually measured for impairment, recorded investment 40,909   40,909   40,288
Total 3,574,967   3,574,967   3,549,137
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 43,047   43,047   47,148
Individually measured for impairment, related allowance 0   0   0
Total 43,047   43,047   $ 47,148
Nonspecific Allowance [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 0     0  
Provision for loan losses 0 0 0 0  
Loans charged off 0 0 0 0  
Recoveries of loans previously charged off 0 0 0 0  
Ending balance 0 0 0 0  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 0 0 0 0  
Provision for off-balance sheet credit risk 0 0 0 0  
Ending balance $ 0 0 0 0  
Previously Reported [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance   315,311 388,640 210,759  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   28,514 36,921 1,585  
Previously Reported [Member] | Commercial [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance   213,438 254,934 118,187  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   14,040 14,422 1,434  
Previously Reported [Member] | Commercial real estate [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance   51,461 86,558 51,805  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   12,575 20,571 107  
Previously Reported [Member] | Paycheck Protection Program [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance   0 0 0  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   0 0 0  
Previously Reported [Member] | Loans to individuals [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance   50,412 47,148 23,572  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   1,899 1,928 44  
Previously Reported [Member] | Nonspecific Allowance [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance   0 0 17,195  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   0 0 0  
Transition Adjustment [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance       25,809  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   0 0 23,552  
Transition Adjustment [Member] | Commercial [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance       33,681  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   0 0 10,144  
Transition Adjustment [Member] | Commercial real estate [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance       (4,620)  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   0 0 11,660  
Transition Adjustment [Member] | Paycheck Protection Program [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance       0  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   0 0 0  
Transition Adjustment [Member] | Loans to individuals [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance       13,943  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   0 0 1,748  
Transition Adjustment [Member] | Nonspecific Allowance [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance       (17,195)  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   $ 0 $ 0 $ 0